Ford rates the 4R100 input torque to include torque multiplication across the torque converter do to slippage, whereas GM and Dodge have provided the maximum engine torque for the Allison 1000 and 47RE respectively. Therefore, though the 4R100 appears to have a significantly higher input torque capacity, it's maximum engine torque input is somewhere near the Allison 1000. In reference to gear spread and step, the Allison 1000 holds a clear advantage over both the 47RE and 4R100 transmissions. Its relatively low 1st gear contributes to superior low speed two performance and the Allison's 4.49 to 1 reverse ratio is favorable to either of its competitors.